Pulp-grinder



(No Model.) 2 sheets-sheet 1.-

D. T. MILLS.

PULP GRINDER. No. 393,075. PatentedNov. 20, 1888.`

N. PETERS. Pwwum ,D. C.

imo-Model.) 2 Smeets-smeet 2. D. T. MILLS.

PULP GRINDBR.

No. 393,075. Patented'Nov. 20, 1888.

UNITED STATES PATENT Orricn.

DAVID T. MILLS, OF DAYTON, OHIO.

PULP-GRINDER.

SPECIFICATION forming part of Letters Patent No. 393,075, dated November20, 1888.

Application iled February 4, 1888. Serial No. 263,040. (No model.)

10 all whom it may concern:

Be it known that I, DAVID T. MILLS, a citizen of the United States,residing at Dayton, in the county ofll/Iontgomery and State of Ohio,have invented certain new and useful Improvements in Pulp-Grinders, ofwhich the follow- .ing is a full, clear, and exact description,reference being had to the accompanying drawings, forming part of thisspecification.

My invention relates to that class of machinery known as wood-pulpgrinders 5 and it consists in certain details of construction andcombinations of parts, which will first be described in connection withthe drawings, and then pointed out in the claims.

In the accompanying drawings, Figure lis a side elevation of one of myimproved grinders, partly in section and with a portion ofthe cas,- ingbroken away. Fig. 2 is a sectional end elevation of the same. Fig. 3 isa perspective view of the presser-box. Fig. 4 is a side elevation of thesame.

The same letters of reference are used to indicate identical parts inall the figures.

The casing A of the grinder may be of the usual or any suitableconstruction, and is in this instance supported on a brick foundation,within which is the usual pit forthe collection of the ground pulp. Thestone B is hung Aon a shaft, C, journaled in boxes or pillow-blocks D,which rest upon overlapping oppositelyset wedges E within a frame, F. Bymeans of set-screws a, tapped through the frame F and bearing againstthe heads of the wedges, the latter may be adjusted to maintain theshaft G in proper vertical alignment, while by means of otherset-screws, b, tapped through the frame F and bearing against the blocksD, the shaft can be adjusted to keep it in proper horizontal alignment.

The blockpressers are composed of the usual or any suitable hydrauliccylinders,G,seeured to the casing and supplied with pistons and piston-rods H, extending through stuffing- -boxes at both ends ofthecylinders. For each cylinder thereis a presser-box, I, Fig. 3,adjustably hung within the grinding-frame by means ofcollar-bolts c,Fig. 2, and held from movement in any direction, except longitudinally,by ribs d, projecting from the inner sides of the grinder-casing againstthe corner edges of the box. These boxes may be tapered-that is,enlarged inside at their lower ends--to prevent the binding of the wood,if desired. Where square blocks are used tapering is not necessary. Thefront ends of the boxes are provided with offsets c, opposite whichgrooves f are cut on the inner side, extending from thetop to thebottornofthe boxthat is to say, parallel with the piston-rodsto receiveset-screws or pins @extending from the presser-platens J ,secured to thelower ends of the piston-rods II to prevent the binding of .Said rods.The sides of theboxes opposite the usual doors, K, in the easing A forthe insertion ofthe wood are provided withopenings, and at the bottom ofsaid openings iianges h are provided either integral with the box, asshown, or secured to the casing A. These flanges are some distance abovethe periphery of the stone, and, with the lower side walls of the boxes,serve to prevent the escape of pulp and water when the doors are opened.The lower edges of the side walls of the boxes conform to thecurvatureof the stone, but are sufficiently above it to permit theescape of the ground pulp over the sides of the stoneinto the pit below.The lower edges of the front walls of the boxes are in close proximityor working contact with the stone, while the lower edges of the rearwalls are some little distance above the stone, as seen in Fig. l, topermit any unground slivers or shims that may escape from one box to becarried by the revolution of the stone under such rear edgesinto thenext box, where they will be converted into pulp. Without this provisionthe shims would accumulate between the boxes and preventthe properspraying of the stone. By means ofthe collar-bolts c the boxes may beadj usted from time to time as the stone wears down to keep them inconstant proper working position.

The piping for the admission of the water to4 the cylinders to actuatethe pistons may be of the usual or any suitable construction. Ihaveillustrated it as in three banks for each machine secured by clips tothe sides of the cylinders, of which the upper pipe, L, is theiniuentpipe, the next lower, M, the eiiiuent pipe, and the lower one, N,the pipe which admits the spraying-water from any desired source throughbranches h and perforated crosspipes IOO Wet machine is employedto'spray Vthe stone,

and the perforations in the pipes i' sometimes become clogged.

Each cylinder is provided with the usual or any suitable ports and afour-way or other suitable valve, into which a branch, k, froml the pipeL extends, and from which a branch,

Z,eXtends to the pipe M for directing the water from the influent pipeto either end of the cylinder or for cutting it out of action whendesired.

The Watersupply may be taken from any source with the requisitepressure.

Having thus fully described my invention, I

claim- 1. In awood-pulp machine,tlie combination, with a stone, a casingoverthe stone provided with one or more doors, and one or inore b1ockpressers applied to said casing, of a presserbox for each block-pressersupported within l the casing and provided with an opening coincidentwith its door in the casing to permit the introduction into said box oi'the blocks to be ground, substantially as described.

2. In a Wood-pulp macliine,the combination,

with astone, a casi ng over the stone provided with one or moredoors,and one or more blockpressers applied to said casing, of apresserbox for each block-presser adj ustably supported within theeasing and provided with an The pipes i extend at one opening coincidentwith its door in the easing 'to permit the "introduction into said boxof the blocks to be ground,substantial1y as described.

3, In a wood-pulp machine,the combination, with a stone, a casing overthe stone provided with one or more doors,and one or more blockpressersapplied to said casing,of an interior-lytapering presser-box for eachblock-presser supported Within said casing and provided with an openingcoincident with its door in the casing to permit the introduction intosaid box of the blocks to be ground, substantially as described.

4. In a wood'pulp machine, a stone and a prcsser-box to receive theblocks to be ground, having its lower front edge in close proximityor-working contact with the stone, its lower rear edge raised above thesurface of the stone to permit the passage of shims, its lower sidesconforming to the curvature of the stone, and an opening in one side topermit t'heintroduction of the blocks to be ground, substantially asdescribed. y

5. The presser-box I, provided with the offsets c, groovesf, an openingin one side to permit theintroduction of the blocks to be ground, andthe iange h at the lower side of said opening, in combination with thecasing A, collarbolts c, ribs d, and the presser-platen provided withset-screws or pins entering the grooves j', substantially as and for thepurpose described.

DAVID T. MILLS. Vi'tnesses:

EDWIN P. MATTHEWS, W. E. DoNsoN.

